It's a good time to introduce energy efficiency, sustainability and green energy to your kids.

The school year is about to start. Yet the weather will remain nice for quite a while. Since school projects and experiments are on kids' way, it's a good time to introduce energy efficiency, sustainability and green energy to your kids. Simple and fun they can be good science projects too!

These experiments will help your kids to understand how renewables work while staying entertained.

1. Wind carThe simplest project on this list.All you need is:

1. One 8×5″ foam board with slit cut into center2. Two 5″ long milk shake straws3. Two 8′ long cake pop sticks4. One 5×5″ cardstock square5. One large craft stick6. Four wooden wheels7. Stickers8. Tape

Directions suggested by Stir the Wonder are easy. Just follow the link: Wind Car

2. A solar oven to bake some potatoesRebecca Cofiño from Mamaguru shares one simple and incredible project with delicious treats after you make it.

3. Small wind turbineThis one is a bit more complicated, yet can last way longer than the solar oven.Don't let the big number of supplies and tools fool you, it is fast in easy to make this turbine and your kid can take it for a science project.

5. Pop-up solar paper homeTiny house made of paper, powered by solar energy lit by LED light. What can be more sustainable than that? Introduce your kid to passive home, place solar next to it and all toy community will live energy efficient and eco-friendly lives.